EPS is an initialism which most often means:

Expanded polystyrene, a plastic made from styrene with voids in it

United States Secret Service, which formerly had a division called Executive Protective Service

European Passenger Service, the railway service in Western Europe operated by Eurostar

Electronic point of sale, an electronic till or cash register

Extrapyramidal symptoms, a group of side effects commonly caused by antipsychotic drugs.

Ensoniq Performance Sampler

Encapsulated PostScript, a graphics file format

Electronic Payment Services, the largest electronic payment system in Hong Kong, Macau and Shenzhen

Express Payment System, the EFTPOS system for ATM cardholders of banks who are affiliated with the Expressnet interbank network in the Philippines

Sandinista Popular Army (Ejército Popular Sandinista) of Sandinista-era Nicaragua

Environmental Law Service (Ekologický právní servis), a Czech non-governmental organization.

Earnings per share, a stock market concept

End point security, a computer security concept in which each device is responsible for its own security

European Physical Society

Electric power steering, a type of power steering system used in cars

Electronic Prescription Service, a service that transmits prescription information from doctors to pharmacies implemented by the ETP team, part of the NHS NPfIT project in England

Extracellular polymeric substance, sticky organic matter produced by microorganisms

EUMETSAT Polar System, a satellite system launched by Eumetsat

Eps, Pas-de-Calais, a commune of the Pas-de-Calais département in northern France